STUDY ON PROPAGATION LAW OF VIBRATION AND ACOUSTIC SIGNALS OF FRP TANKS

Abstract

Abstract: The problem of weak acoustic emission signal for passive detection of large tank is studied. According to the detection of acoustic vibration principle, the incentive raw materials (nylon, stainless steel, plastic) were selected to do active tapping test on the 10 mm wall thickness epoxy resin glass fiber reinforced plastic storage tank. Based on the acquisition of signals using acoustic emission equipment, stainless steel was selected as optimal material, and a spring hammer frock was designed. Acoustic vibration test of FRP tanks in laboratory was carried out by using spring hammer, the results show that the hitting speed is the fastest and the amplitude attenuation is minimum in the horizontal direction. As the direction angle increases, the wave velocity decreases gradually and the amplitude attenuation rate increases gradually. The propagation model and amplitude attenuation law of acoustic and vibration signals are obtained. Overall, the sound vibration signal propagation distance is longer than the passive acoustic emission signal, which lays the foundation for the later research on the inspection of FRP tank defects by acoustic vibration method.

Key words: glass fiber reinforced plastics, acoustic vibration method, spring hammer, sound velocity, amplitude attenuation

CLC Number:

TB332

CHEN Jian-fei,XIE Ke-ming*,YANG Yong,LIU Yan-guo. STUDY ON PROPAGATION LAW OF VIBRATION AND ACOUSTIC SIGNALS OF FRP TANKS[J]. Fiber Reinforced Plastics/Composites, 2018, 0(7): 103-107.

References

[1] 邬冠华, 林俊明, 任吉林, 等. 声振检测方法的发展[J]. 无损检测, 2011, 33(2): 35-41.
[2] 李家伟, 陈积懋. 无损检测手册[M]. 北京: 机械工业出版社, 2002: 294-351.
[3] 冷劲松, 杜善义, 顾震隆. 配橡胶内衬复合材料板壳的敲击法无损检测[J]. 材料科学与工艺, 1993, 1(2): 51-54.
[4] 冷劲松, 杜善义, 王殿富, 等. 复合材料结构敲击法无损检测的灵敏度研究[J]. 复合材料学报,1995, 12(4): 99-105.
[5] Cawley, P. Adams R D. The mechanics of the coin-tap method of non-destructive testing[J]. Journal of Sound Viration, 1988(122): 299-316.
[6] 闫晓东. 飞机复合材料结构智能敲击检测系统研究[D]. 南京: 南京航空航天大学, 2007.
[7] 宋育. 飞机复合材料无损检测敲击技术的研究和应用[D]. 南京: 南京航空航天大学, 2009.
[8] 陶鹏. 风电叶片脱层损伤的声振检测技术研究[D]. 南京: 南京航空航天大学, 2014.
[9] 杨瑞峰, 马铁华. 声发射技术研究及应用进展[J]. 中北大学学报, 2006, 27(5): 456-460.
[10] Johnson M, Gudmundson P. Broad-band transient recording and characterization of acoustic emission events in composite laminates[J]. Journal of Materials Sciences, 1998(33): 2357-2363.
[11] P. Ramasamy, S. Sampathkumar, P. Prsath. Experimental investigation of impact damage on woven GFRP composite laminate using acoustic emission and ultrasonic technique[R]. Proceedings of the National Seminar & Exhibition on Non-Destructive Evaluation, 2011: 55-59.
[12] 沈功田, 李金海. 压力容器无损检测——声发射检测技术[J]. 无损检测, 2004(9): 457-463.
[13] 谈平庆, 董绍平. 声发射技术在大型储罐腐蚀检测中的应用[J]. 石油化工腐蚀与防护, 2007(3): 45-49.
[14] 张家凡. 声发射技术在大型储罐安全检测中的应用[J]. 科技咨询导报, 2007(9): 6.
[15] 周伟, 田晓, 张婷. 风电叶片玻璃钢复合材料声发射衰减与源定位[J]. 河北大学报, 2012, 32(1): 100-104.